JP3055198B2 - Ammonia absorption device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ammonia absorbing apparatus for removing ammonia from a vaporized gas containing ammonia gas in an exhausted ammonia water tank when supplying ammonia water into an ammonia water tank. Things.

[0002]

2. Description of the Related Art In general, ammonia water used in a denitration apparatus or the like emits a strong irritating odor when it is vaporized, and is therefore stored in a closed ammonia water tank. The ammonia water tank is installed underground with relatively little change in temperature, and supplies the stored ammonia water to a denitration device or the like by a pump as needed. Further, the supply of the ammonia water to the ammonia water tank is supplied from an ammonia water lorry vehicle located on the ground by using the head pressure through an ammonia water receiving pipe.

[0003]

As described above, since the ammonia water tank is a closed type, when supplying the ammonia water to the inside, the vaporized ammonia in the ammonia water tank is exhausted to the outside. However, depending on the installation location, there is a risk that the local environment will be harmed if released directly to the atmosphere. When discharging the stored ammonia water from the inside, it was necessary to provide a check valve for introducing air into the inside according to the amount of discharge.

Accordingly, the present invention has been devised in order to effectively solve the above-mentioned problems, and its object is to remove ammonia from exhaust gas containing ammonia gas,
An object of the present invention is to provide an ammonia absorbing device having a check valve function.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method of removing ammonia from exhaust gas containing ammonia gas in an upper portion of an ammonia water tank discharged when supplying the ammonia water to the ammonia water tank. A vent line for the exhaust gas is connected to the top of the ammonia water tank, the vent line is connected to the top of a seal tank, and the inside of the seal tank is vertically divided by a partition plate. A water supply layer is formed in the upper chamber on the plate, an ammonia-absorbing water layer is formed in the lower chamber, and the partition plate has an upper end located on the water surface of the water-supply layer and a lower end immersed in the ammonia-absorbing water layer. A communication tube is provided, a perforated plate is provided at the lower end of the communication tube, and the gas above the ammonia-absorbing water layer is guided to the upper portion of the water supply layer by the partition plate. A cylinder is further provided on the upper part of the exhaust cylinder, a lower end surrounding the lower part is immersed in the water supply layer, and an upper end is provided with a supply / exhaust cylinder extending outside the seal tank. A spray nozzle for injecting water into the gas discharged from the upper part of the exhaust pipe is provided.

[0006]

Since the present invention is constructed as described above, when the ammonia water is supplied into the ammonia water tank and the pressure becomes high,
Exhaust gas containing ammonia gas is introduced into the seal tank from the vent line, passes through the communication tube from the upper chamber, is introduced into the lower chamber, and is injected from the perforated plate at the lower end of the communication tube into the ammonia absorption water layer. Most of the ammonia is absorbed by the ammonia-absorbing water by gas-liquid contact with the ammonia-absorbing water. After that, the exhaust gas is introduced from the exhaust pipe to the supply / exhaust pipe, and comes into gas-liquid contact with the industrial water injected from the spray nozzle again to absorb the remaining ammonia, and then is discharged from the supply / exhaust pipe to the outside. become. Therefore, the exhaust gas that has passed through the ammonia absorbing device contains almost no ammonia.

In a stationary state, that is, when there is no change in the amount of ammonia water in the ammonia water tank, the ammonia water is sealed by the ammonia absorption water layer and the water supply layer.
Exhaust gas containing ammonia gas in the ammonia water tank is not released to the outside. On the other hand, when the inside of the ammonia water tank becomes negative pressure using the stored ammonia water, the water surface inside the air supply / exhaust cylinder lowers, outside air is introduced from the air supply / exhaust cylinder into the seal tank, and the ammonia water is supplied from the vent line. It will be supplied into the tank. Therefore, the ammonia absorbing device also has the function of an air check valve.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows a state in which an ammonia absorbing device 1 of the present invention is connected to an ammonia water tank 2.

This ammonia water tank 2 is installed underground in consideration of temperature change and safety, and stores ammonia water on a concrete base 3 constructed underground as shown in the figure. Tank body 4 is provided. The drain valve 6, the liquid level gauge 7,
A level switch 8 is provided, and a shut-off valve 5 is provided on the top of the tank body 4 at the top and bottom.
Water receiving pipe 1 that receives ammonia water from
0 is provided vertically through it.

An end of a vent line 11 for discharging exhaust gas containing ammonia gas in the tank body 4 and for sucking outside air is connected to a substantially central portion of the tank body 4.
The other end of the vent line 11 is connected to the ammonia absorbing device 1 of the present invention.

The ammonia absorbing device 1 is for absorbing ammonia from exhaust gas containing ammonia gas in the ammonia water tank 2 which is exhausted when the ammonia water is supplied from the ammonia water truck 9 into the ammonia water tank 2. As shown in FIG. 2 and FIG. 3, the other end of the vent line 11 is connected to the top of a cylindrical sealing tank 12 so that exhaust gas is introduced into the inside. Has become.

The inside of the seal tank 12 is vertically divided by a partition plate 13 and an upper chamber 14 above the partition plate 13.
Has a water supply layer 15 filled with industrial water
Is formed, and the lower chamber 1 below the partition plate 13 is formed.
6, similarly to the upper chamber 14, an ammonia-absorbing water layer 17 filled with industrial water is formed up to the vicinity of the middle. At the approximate center of the partition plate 13, the upper end is located on the water surface of the water supply layer 15, and the lower end is located at the ammonia absorption water layer 1.
A communication tube 18 immersed in the tube 7 is vertically penetrated therethrough, and a perforated plate 19 is provided at the lower end of the communication tube 18 so as to be submerged in the ammonia absorption water layer 17. Exhaust gas introduced into the upper chamber 14 via the line 11 is further introduced into the lower chamber 16 and the perforated plate 19
Then, the gas is uniformly jetted into the ammonia-absorbing water layer 17 and brought into gas-liquid contact with the ammonia-absorbing liquid to absorb the ammonia in the exhaust gas.

The partition plate 13 has an exhaust pipe 2 for guiding the gas above the ammonia-absorbing water layer 17 to above the water supply layer 15.
0 is provided vertically so as to penetrate it. The upper end of the exhaust pipe 20 is located above the water supply layer 15 of the upper chamber 14, and the exhaust gas passing through the ammonia-absorbing water layer 17 is introduced into the upper chamber 14.

A supply / exhaust cylinder 21 is provided at the upper end of the exhaust cylinder 20.
Is provided. As shown, the supply / exhaust tube 21 is provided so that the upper end thereof penetrates the top of the seal tank 12, the lower end surrounds the upper end of the exhaust tube 20, and is provided in the water supply layer 15 of the upper chamber 14. It is located to soak. A supply / exhaust port 22 for exhausting exhaust gas discharged from the upper portion of the exhaust tube 20 and sucking outside air is provided at a side portion of the supply / exhaust tube 21 so as to extend horizontally. A spray nozzle 23 for injecting the industrial water W into the exhaust gas discharged from the upper part of the exhaust pipe 20 is provided inside.

A funnel-shaped water injection hopper 24 is provided at the top of the seal tank 12 so as to vertically penetrate therethrough, and always supplies a small amount of industrial water W to the water supply layer 15 of the upper chamber 14. ing. Also, the lower chamber 16 of the sealing tank 12
Has an upper end located at the surface of the ammonia-absorbing water layer 17
A letter-shaped overflow pipe 25 is provided to discharge a part of the increased ammonia-absorbed water in the ammonia-absorbed water layer 17 to the outside. Further, a drain pipe 26 is provided near the overflow pipe 25, and is used for draining water when cleaning the lower chamber 16.

Next, the operation of the present invention will be described.

As shown in FIG. 1, the ammonia water tank 2
When the amount of ammonia water inside decreases, the ammonia water receiving pipe 1
0 is opened from the ammonia water lorry vehicle 9 using the head pressure of the ammonia water
Is supplied into the aqueous ammonia tank 2 via Then
The level of the aqueous ammonia in the aqueous ammonia tank 2 rises and the internal pressure rises, and the vaporized gas containing the ammonia gas in the aqueous ammonia tank 2 passes through the vent line 11 and is introduced into the ammonia absorbing device 1.

In FIG. 2, as shown by the solid line, the ammonia-containing vaporized gas introduced from the vent line 11 into the sealing tank 12 of the ammonia absorbing device 1 is provided from the upper chamber 14 to the partition plate 13 by the pressure. After passing through the communication tube 18, the lower end of the ammonia absorbing water layer 17
After most of the ammonia, which is uniformly dispersed by the perforated plate 19 and contained in gas-liquid contact with the ammonia-absorbing water, is absorbed by the ammonia-absorbing water, the exhaust pipe 20 provided on the partition plate 13 Will be introduced. Next, the exhaust gas in which most of the ammonia introduced into the exhaust pipe 20 has been absorbed is discharged into the supply / exhaust pipe 21 from the upper end thereof.
After the remaining ammonia is removed by further gas-liquid contact with the industrial water W injected from the spray nozzle 23, the ammonia is released from the supply / exhaust port 22 to the atmosphere. In this case, as shown in FIG. 4, the liquid level in the supply / exhaust cylinder 21 rises to L and the exhaust gas containing ammonia is sealed so as not to flow directly to the supply / exhaust cylinder 21. The industrial water W sprayed from the spray nozzle 23 and absorbing the ammonia is supplied to the water supply layer 15.
And then overflows from the upper end of the communication tube 18 and merges with the industrial water in the ammonia-absorbing water layer 17 in the lower chamber 16, overflows from the upper end of the overflow pipe 25, and is returned to the ammonia water tank 2 through the pipe. It is. When the supply of the aqueous ammonia into the aqueous ammonia tank 2 ends, the internal pressure in the aqueous ammonia tank 2 becomes equilibrium with the atmospheric pressure, and the flow of the vaporized gas stops.

Next, the ammonia water in the ammonia water tank 2 is discharged from the ammonia water discharge pipe 5 and supplied to the use destination. When the pressure in the ammonia water tank 2 becomes lower than the atmospheric pressure, as shown by a broken line in FIG. The outside air is introduced from the air supply / exhaust port 22 into the air supply / exhaust tube 21 to lower the water level of the water supply layer 15 in the air supply / exhaust tube 21 to LL as shown in FIG. After being introduced into the water supply layer 15, it rises by buoyancy, is introduced into the upper chamber 14, is introduced from the vent line 11 into the ammonia water tank 2, and raises the inside of the ammonia water tank 2 to atmospheric pressure. When the discharge of the aqueous ammonia into the aqueous ammonia tank 2 is completed, the internal pressure in the aqueous ammonia tank 2 becomes equilibrium with the atmospheric pressure, and the flow of air is stopped.

Also, the water supply layer 1 is always in
The small amount of industrial water W injected into the tank 5 raises the water supply layer 15 to a predetermined level, overflows from the upper end of the communication tube 18, flows into the ammonia-absorbing water layer 17, 17 is further raised to a predetermined level, and then overflows from the upper end of the overflow pipe 25 and is discharged to the outside. Thereby, it can be easily confirmed that the industrial water W of the water supply layer 15 and the ammonia absorption water layer 17 is maintained at a predetermined level.

As described above, according to the present invention, the exhaust gas containing ammonia discharged from the ammonia water tank 2 is injected into the ammonia absorbing water layer 17 to remove most of the ammonia, and then the industrial water is sprayed again from the spray nozzle 23. W
Therefore, most of the ammonia in the exhaust gas released into the atmosphere can be absorbed.
In addition, since the water supply layer 15 and the ammonia-absorbing water layer 17 in the seal layer 12 function as a check valve for air, the check valve conventionally required becomes unnecessary.

[0023]

As described above, in summary, according to the present invention, it is possible to absorb most of the ammonia contained in the exhaust gas containing ammonia discharged from the ammonia water tank, thereby eliminating the possibility of adversely affecting the local environment. It has the effect.

[Brief description of the drawings]

FIG. 1 is an overall view showing a state in which an ammonia absorbing device of the present invention is connected to an ammonia water tank.

FIG. 2 is a schematic diagram showing one embodiment of the ammonia absorbing device of the present invention.

FIG. 3 is a plan view of the ammonia absorbing device of the present invention.

FIG. 4 is a state diagram of a water seal when ammonia gas is absorbed.

FIG. 5 is a diagram showing a state of a water seal when inhaling outside air.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ammonia absorption device 2 Ammonia water tank 11 Vent line 12 Seal tank 13 Partition plate 15 Water supply layer 17 Ammonia absorption water layer 18 Communication cylinder 19 Perforated plate 20 Exhaust cylinder 21 Supply / exhaust cylinder 23 Spray nozzle

Claims (1)

(57) [Claims] An ammonia absorbing device for removing and exhausting ammonia from exhaust gas containing ammonia gas in an upper portion of an ammonia water tank discharged when supplying the ammonia water to the ammonia water tank. A vent line for the exhaust gas is connected, the vent line is connected to the top of a sealing tank, the inside of the sealing tank is vertically divided by a partition plate, and a water supply layer is formed in an upper chamber on the partition plate. An ammonia absorbing water layer is formed on the partition plate, and an upper end is located on the water surface of the water supply layer, and a lower end is provided with a communication tube immersed in the ammonia absorbing water layer, and a perforated plate is provided at the lower end of the communication tube. The partition plate further includes an exhaust pipe for guiding the gas above the ammonia-absorbing water layer to the upper water supply layer, and further surrounds the exhaust pipe above the exhaust pipe. And the lower end is immersed in the water supply layer,
Ammonia absorption, characterized in that a supply / exhaust cylinder whose upper end extends outside the seal tank is provided, and a spray nozzle for injecting water into gas exhausted from the upper part of the exhaust cylinder is provided in the supply / exhaust cylinder. apparatus.